The content for this textbook is part of the Enhanced WebAssign series from Brooks/Cole. An Enhanced WebAssign access card is required for this book. This special access card can be packaged with a new textbook, so WebAssign is available to your students at no additional cost. The access card can also be purchased online or at the bookstore by students who do not purchase a new textbook.

Your students can purchase the eBook version of the textbook online.The eBook will be available to your students for as long as it is used in your course for up to 2 consecutive semesters or 3 consecutive quarters.

Please discuss how to order Horizons - Exploring the Universe 11e packaged with WebAssign with your textbook representative or WebAssign.

When you use WebAssign with the pedagogy and content found in this textbook, you have access to the best-in-breed solution to your homework and assessment needs. Special problems ask your students to analyze photos and graphs, manipulate interactive Active Figures and assess their understanding. An eBook version of the textbook is linked to each reading question to enable your students to review text material. When you assign homework using WebAssign, your students are able to interact with the very concepts they are learning about!

Active Figures - visualize astronomy in action
Animated figures from the text come to life and allow students to visualize phenomena and processes that can't be represented on the printed page. In addition to viewing animations of the figures from the text, students can change variables to see the effects, conduct suggested explorations of the principles involved in the figure, and take and receive feedback on quizzes related to the figure.

Reading Questions - test your students' reading comprehension
Reading questions test for comprehension of the text material. You can assign these questions as incentive to keep up on the reading assignments.

Guidepost Questions - get organized right from the start
At the start of each chapter the Guidepost helps your students see the organization of the book connecting previous chapters with following ones. The Guidepost Questions cast a series of essential questions that are answered in the chapter.

Review Questions - end-of-chapter test of understanding
After reading the chapter and participating in class discussions, end-of-chapter review questions help pull all of it together one final time.

Ranking Tasks - understanding how scientists know
Ranking questions are designed to help your students understand why scientist can make logical arguments about how nature works.

Seeds eBook Version - immediate access to the textbook: anywhere, anytime
The online version provides your students with web-based access to a digital version of Michael A. Seeds'
best-selling astronomy textbook allowing them a completely interactive learning experience, combining the complete text narrative with Active Figures - animated versions of key illustrations from your text.

Below is a list of questions for this book that are available in WebAssign. These questions are based on your textbook with minor wording changes to make them work in a web environment. As often as possible, variables, numbers, or words have been randomized so that each student will receive a unique version.

Questions listed in black are ready for immediate use in an assignment. Questions in blue are under development, and should be available shortly. This list is updated nightly. Please contact WebAssign if you need access to a blue question or additional questions from this textbook.

You may duplicate a question and change it as you like for your class.

Some questions such as "sketch a graph" and "derive an expression" cannot be answered by WebAssign, at this time.